EP1556849A1 - Dispositif d'affichage electroluminescent organique en couleurs - Google Patents

Dispositif d'affichage electroluminescent organique en couleurs

Info

Publication number
EP1556849A1
EP1556849A1 EP03808778A EP03808778A EP1556849A1 EP 1556849 A1 EP1556849 A1 EP 1556849A1 EP 03808778 A EP03808778 A EP 03808778A EP 03808778 A EP03808778 A EP 03808778A EP 1556849 A1 EP1556849 A1 EP 1556849A1
Authority
EP
European Patent Office
Prior art keywords
colour
sub
light
full
pixel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03808778A
Other languages
German (de)
English (en)
Inventor
Coen T. H. F. Liedenbaum
Henricus F. J. J. Van Tongeren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of EP1556849A1 publication Critical patent/EP1556849A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

Definitions

  • the present invention relates to a full-colour organic electro-luminescent display device comprising a plurality of independently addressable full-colour pixels, each pixel comprising four sub-pixels (RGBX).
  • An organic electro-luminescent (EL) display device comprises spaced electrodes separated by an organic light-emitting medium which emits electromagnetic radiation, typically light, as a response to the application of an electrical potential between the electrodes.
  • a plurality of individually electrically addressable light-emitting pixels typically arranged in a matrix.
  • the term pixel refers to an area of a display panel that can be stimulated to emit light independently of other areas.
  • each pixel is divided in sub-pixels.
  • the term sub-pixel refers to any portion of a pixel which can be independently addressable to emit a specific colour.
  • a blue, a green, and a red sub-pixel typically, a blue, a green, and a red sub-pixel.
  • the red, green, and blue colours constitute the three primary colours which span a colour triangle. All colours within the triangle can be generated by appropriately mixing these colours. By changing an intensive ratio between each of the sub-pixels, a colour tone can be changed.
  • each pixel consists of red-green-blue (RGB) light-emitting diodes (LEDs) generally in a planar arrangement.
  • the diode structure generally comprises an anode layer made of a transparent electrode, such as indium tinoxide (ITO), a hole transport layer(s), an organic light-emitting layer, an electron transport layer and a cathode layer made of a metal, such as aluminium, or an alloy, such as magnesium-indium.
  • OLEDs organic LEDs
  • the LEDs are referred to as polymer LEDs (PLEDs).
  • white light has generally been generated by a mixture of red, green, and blue colour.
  • this generation of white light is not very efficient with regard to power consumption. Since white light is dominant in most pictures, the generation of white light is a rather important factor for the overall power consumption of the display device.
  • JP 2000200061 discloses an organic electro-luminescent display comprising pixels constituted of red, green, blue, and white light-emitting sub-pixels (RGBW).
  • RGBW white light-emitting sub-pixels
  • An object of the present invention is to provide an organic electro-luminescent display which is more efficient and/or has an extended lifetime.
  • a full-colour organic electro-luminescent display device comprising a plurality of independently addressable full- colour pixels, each full-colour pixel (RGBX) comprising four sub-pixels, i.e. a red (R), a green (G), a blue (B) light-emitting sub-pixel, and a fourth additional light-emitting sub-pixel (X), wherein the fourth sub-pixel (X) emits light of a non-white colour with the efficiency of each of the R (red), G (green), and B (blue) sub-pixel.
  • RGBX full-colour pixel
  • White light, and any other colour which can be generated by mixing in light from the fourth sub-pixel can be efficiently generated by mixing light emitted from the fourth sub-pixel and light from at least one of the red, green, or blue light-emitting sub- pixels).
  • the pixel comprising said fourth sub-pixel (X) enables a more efficient generation of white light than a pixel comprising only RGB sub-pixels. Hence, a lower power consumption is required for the generation of white light.
  • said non-white colour has colour coordinates outside the colour area defined by the colour coordinates corresponding to light emitted from the RGB sub- pixels.
  • RGBX-LED light-emitting diode
  • the light-emitting compound in the fourth sub-pixel (X) could either be an organic low-molecular compound or a (organic) polymer.
  • the fourth sub-pixel comprises a polymeric electro-luminescent compound.
  • the RGBX-LED is preferably a RGBX-PLED (polymer light-emitting diode).
  • Preferred polymeric electro-luminescent compounds are unsubstituted and substituted poly(para-phenylen-vinylene) (PPV).
  • One way to generate white light in a full-colour organic electro-luminescent display device is to combine light from an additional sub-pixel comprising a yellow/green light-emitting compound and light from the blue light-emitting sub-pixel.
  • the non- white colour emitted from the fourth sub-pixel (X) is preferably yellow/green light.
  • the electro-luminescent compound in the fourth sub-pixel (X) is advantageously a yellow/green light-emitting compound, such as yellow/green light-emitting poly(para-phenylen-vinylene) supplied by Covion Organic Semiconductors GmbH (Frankfurt, Germany), herein referred to as Covion Yellow/Green.
  • Covion Yellow/Green displays several advantages, such as a high DC- efficiency (about 10 cd/A), a high stability in terms of life time (operative life time > 30 000 h), and colour coordinates outside the colour area defined by the colour coordinates corresponding to light emitted from the RGB primaries.
  • a blue/green light-emitting compound having colour coordinates outside the colour area defined by the colour coordinates corresponding to light emitted from the RGB sub-pixels, may also advantageously be used.
  • each full-colour pixel comprises a plurality of subsets of sub-pixels available for emitting light of a desired colour.
  • Said device according to the invention preferably comprises driving means for selectively addressing the subset among the plurality of subsets which provides the desired colour with the highest efficiency or with the longest life time of the sub-pixels.
  • the driving means may be formed electronic circuitry which is adapted, or more specific programmed if programmable electronic circuitry is used,to perform the required selection.
  • the circuitry is conveniently provided in the form of an integrated circuit.
  • Fig 1 shows colour coordinate ranges for primaries in a full-colour display.
  • Fig 2 shows a colour area obtained using a display device comprising RGB primaries.
  • Fig 3 shows a colour area obtained using an embodiment of a display device comprising RGBX primaries according to the invention.
  • Fig 4 shows a colour area obtained using an embodiment of a display device comprising RGBX primaries according to the invention.
  • Fig 5 shows the estimated colour track obtained by shifting the emission spectrum of Yellow/Green Covion.
  • Fig 6 shows the efficiency ratio ⁇ GB ⁇ ⁇ RGB as a function of colour distance (d) for the primaries discussed in Example 1.
  • Fig 7 shows the efficiency ratio T
  • Fig 1 shows the area generally referred to as the "colour triangle".
  • the so- called EBU (European TN-primaries) coordinates are indicated by the + markers and serve as a reference.
  • the areas bounded by straight lines and the edge of the colour triangle generally serve as primary coordinate ranges.
  • light from a red primary generally has colour coordinates within the colour triangle where x > 0.61 , as shown in Fig 1.
  • Light from a green primary generally has colour coordinates within the colour triangle where 0.23 ⁇ x ⁇ 0.39 and 0.52 ⁇ y ⁇ 0.70, as shown in Fig 1.
  • Fig 2 shows a colour area defined by colour coordinates for light generated by specific RGB primaries. Any colour within the area can be generated by mixing the right portions of light from the three RGB primaries. For instance, white can be generated by mixing red, blue and green light.
  • white light is defined as a colour lacking hue.
  • non-white light is defined as a colour having a hue.
  • hue refers to the intensity profile of light emission within the visible spectrum, with different hues exhibiting visually discernible differences in colour.
  • Fig 3 and Fig 4 show examples of colour areas obtainable by display devices according to the invention. The colour areas are defined by the colour coordinates for light generated by the RGB primaries and an additional light-emitting sub-pixel (X) in accordance with the present invention.
  • a way to generate white light in a full-colour organic electro-luminescent display device is to combine light from the additional sub-pixel and light from at least one of the red, green, or blue light-emitting sub-pixel(s).
  • the additional sub-pixel (X) preferably emits light having colour coordinates outside the colour area defined by the colour coordinates corresponding to light emitted from the RGB sub-pixels.
  • Fig 3 shows a colour area obtained using a display device according to the invention comprising a red (R), a green (G), a blue (B), and a yellow/green (Y) light emitting sub-pixel.
  • Fig 4 shows a colour area obtained using a display device according to the invention comprising a red (R), a green (G), a blue (B), and a blue/green (Bg) light emitting sub-pixel.
  • the colour area obtained can be divided into several colour triangles.
  • these colour triangles are RGB, RBY, RGY, and GBY.
  • two sets of primaries are available, i.e. RGY and GBY in Fig 3.
  • each RGBY full-colour pixel comprises two subsets of sub-pixels available for emitting light of a desired colour. This means that the load on a primary (in terms of life time) can be reduced by a factor of two.
  • the selection among said sets during driving of the device may either be optimised in view of efficiency or in view of life time of the sub-pixels.
  • Unsubstituted poly(para-phenylen-vinylene) emits in the yellow-green region of the visible spectrum.
  • Diaikoxy-substituted poly(para-phenylen-vinylene) usually emit in the orange
  • dimethoxy-substituted PPV and MEH-PPN poly(2-methoxy-5(2'-ethyl-hexyloxy)-para-phenylen-vinylene), which are obtainable from Covion Organic Semiconducturs GmbH (Frankfurt, Germany).
  • Polyfluorenes usually emit light in the blue-green region of the spectrum.
  • An example is 9,9-dimethyl-substituted polyfluorene, which is obtainable from Covion Organic Semiconductors GmbH (Frankfurt, Germany).
  • Spiro compounds available from Covion Organic Semiconducturs GmbH (Frankfurt, Germany).
  • Spiro-6PP Spiro Octopus, which emit light in the blue region of the spectrum.
  • Table 1 shows some polymer LED primaries that currently are commercially available.
  • CDT-D Red is a red light-emitting polyfluorene available from Cambridge Display Technologies (United Kingdom).
  • Dow-K4 Green is a green light-emitting polyfluorene available from Dow Chemical Company.
  • Covion Blue is a blue light-emitting poly(9,9'-spiro-bisfluorene) available from Covion Organic Semiconductors GmbH (Frankfurt, Germany).
  • Covion Yellow/Green is, as disclosed above, a yellow/green light-emitting poly(para-phenylen-vinylene) available from Covion Organic Semiconducturs GmbH (Frankfurt, Germany). It consists of the units shown in Formula I.
  • Covion Yellow/Green emits yellow/green light with a high power efficiency (about 10 cd/A) which is higher than the efficiencies of the RGB primaries. These efficiency values were obtained using a direct current (DC).
  • Covion Yellow/Green exhibits an extraordinary high stability in terms of life time as compared to other known primaries. Stability is usually tested by an accelerated test, wherein the polymer under test is operated at a constant current level for a long time at 80°C. At regular intervals the emission and required voltage are measured. Generally, life time of a primary is defined as the time point when the emission is decreased to 50% of the initial value. Thus, use of Covion Yellow/Green as a primary improves the stability of the whole display device.
  • White light can be efficiently generated by mixing yellow/green light and blue light.
  • Example 1 The emission spectrum of Covion Yellow/Green shown in Table 1 was shifted to obtain an estimate of colour coordinates and efficiency of suitable RGB primaries. The thus obtained colour track is shown in Fig 5. As a reference for the colours that should be made by a full-colour PLED-display, the colour area of a so-called RGBW-monitor (RGBW) is shown.
  • RGBW RGBW-monitor
  • Table 2 indicates suitable RGB primaries to be combined with Covion Yellow/Green.
  • the calculated colour coordinates and efficiencies for said suitable red/green/ blue light-emitting (LE) polymers are given in Table 2.
  • the efficiency of the white light generation is calculated to be 5.18 cd/A.
  • White light generated by a luminance mix of the RGB primaries (30% red light, 57% green light and 13% blue light) has a calculated efficiency of 4.54 cd/A.
  • the distance (d) between the white light coordinates and the coordinates of each R G/B primary is taken to be 1.
  • Example 1 To produce white light, the same luminance mix as indicated in Example 1 is still required (16% blue light and 84% yellow/green light), but twice as much current as in Example 1 is needed to produce the blue light.
  • This efficiency should be compared to an efficiency of 2.27 cd/A for generation of white light from a luminance mix of red, green, and blue light.
  • the display device according to the invention provides a more efficient generation of white light and other colours than a pixel comprising merely RGB primaries, which means that a lower power consumption is required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention concerne un dispositif d'affichage électroluminescent organique en couleurs comprenant des diodes électroluminescentes RGBX, le quatrième sous-pixel (X) présentant une efficacité supérieure à celle des sous-pixels RGB. Ledit dispositif permet une génération de puissance plus efficace de lumière blanche et d'autres couleurs, il présente une durée de vie prolongée et, de préférence, une gamme de couleurs étendue en comparaison aux diodes électroluminescentes RGB traditionnelles.
EP03808778A 2002-10-18 2003-08-13 Dispositif d'affichage electroluminescent organique en couleurs Withdrawn EP1556849A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1021703 2002-10-18
NL1021703 2002-10-18
PCT/IB2003/003620 WO2004036535A1 (fr) 2002-10-18 2003-08-13 Dispositif d'affichage electroluminescent organique en couleurs

Publications (1)

Publication Number Publication Date
EP1556849A1 true EP1556849A1 (fr) 2005-07-27

Family

ID=32105709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03808778A Withdrawn EP1556849A1 (fr) 2002-10-18 2003-08-13 Dispositif d'affichage electroluminescent organique en couleurs

Country Status (8)

Country Link
US (1) US20060044226A1 (fr)
EP (1) EP1556849A1 (fr)
JP (1) JP2006503411A (fr)
KR (1) KR20050065605A (fr)
CN (1) CN1689064A (fr)
AU (1) AU2003253179A1 (fr)
TW (1) TW200421219A (fr)
WO (1) WO2004036535A1 (fr)

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Also Published As

Publication number Publication date
TW200421219A (en) 2004-10-16
WO2004036535A1 (fr) 2004-04-29
US20060044226A1 (en) 2006-03-02
AU2003253179A1 (en) 2004-05-04
CN1689064A (zh) 2005-10-26
JP2006503411A (ja) 2006-01-26
KR20050065605A (ko) 2005-06-29

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